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Influence of the initial size of the proton layer in sheath field proton acceleration

Published online by Cambridge University Press:  28 August 2013

Jinqing Yu ,
Xiaolin Jin ,
Weimin Zhou ,
Bo Zhang ,
Zongqing Zhao ,
Leifeng Cao ,
Bin Li ,
Yuqiu Gu ,
Rongxin Zhan  and
Z. Najmudin
Jinqing Yu
Affiliation:
Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu, People's Republic of China Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China The Blackett Laboratory, Imperial College, London, United Kingdom
Xiaolin Jin
Affiliation:
Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu, People's Republic of China
Weimin Zhou
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China
Bo Zhang
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China
Zongqing Zhao
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China
Leifeng Cao
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China
Bin Li*
Affiliation:
Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu, People's Republic of China
Yuqiu Gu
Affiliation:
Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, People's Republic of China Institute of Engineering Physics, College of Science National University of Defense Technology, Changsha, People's Republic of China
Rongxin Zhan
Affiliation:
School of Information Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
Z. Najmudin
Affiliation:
The Blackett Laboratory, Imperial College, London, United Kingdom
*
Address correspondence and reprint requests to: Bin Li, Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China. E-mail: libin@uestc.edu.cn
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Abstract

We investigate the influence of the initial size of the proton layer on proton acceleration in the interaction of high intensity laser pulses with double-layer targets by using two-dimensional particle-in-cell code. We discuss the influence of proton layer initial sizes on the cut-off energy, energy spread, and divergence angle of proton beam. It is found that Coulomb explosion plays an important role on the proton cut-off energy. This causes the cut-off energy to increase for increasing proton layer thickness, at the expense of energy spread. The proton divergence angle reaches a peak value and then falls again with increasing the width. Proton divergence angle grows with target thickness. It is found that there is an optimal thickness to obtain the narrowest energy spread, which may provide an effective method (change the size of proton layer) to obtain high quality proton beams. This work may serve to improve the understanding of sheath field proton acceleration.

Keywords

Coulomb explosionInitial size of the proton layerParticle-in-cellSheath field proton acceleration
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 4 , December 2013 , pp. 597 - 605
Copyright
Copyright © Cambridge University Press 2013 

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